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Re: Quality of HVX / HPX in 24p vs HMC150 in 1080

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Jeff Regan
Re: Quality of HVX / HPX in 24p vs HMC150 in 1080
on Dec 28, 2009 at 11:55:46 pm

Isaac,

Don't use bit rate as a quality comparison because DVCPRO HD is a DCT based codec that is much older and less efficient than an h.264 AVC codec. DVCPRO HD at 720/24PN runs at 40Mbps, not 100Mbps anyway.

What you get with a full sample codec is better resolution if the front end of the camera can actually produce a full raster image. The CCD's in an HVX200/A, HPX170, HMC150 are pixel shifted, doubling the pixel count from 540X960 to 1080X1920, in theory. However, this does not have the true resolution as a full raster sensor. But, you are recording more samples horizontally with square pixels with AVC HD vs. rectangular pixels that sub-sample 1080X1920 down to 1080X1280 in the case of DVCPRO HD, just as HDCAM sub-samples to 1440.

Some of the lack of color space in a 4:2:0 codec can be replaced by a full sample codec, but the real detail has to exist in the first place.

I haven't done side by side testing of the 150 and 170 because the 150 doesn't do enough of what I want, and I already had 2/3" DVCPRO HD cameras, so the 170 made more sense as a B-camera.

Ultimately you need to decide on which workflow works best for you, whether you want to spend $600 per 32Gb P2 card, if the off-speed capabilities of the 170 are important and what kind of monitoring you have.

If you want the most possible resolution, then an HPX300 is the best choice, and twice the dollars, of course!



Jeff Regan
Shooting Star Video
http://www.ssv.com


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